Watch below as Anthony Joshua says his body has been broken down and rebuilt for his latest title defence against Alexander Povetkin.

Mike Costello
BBC Sport boxing correspondent at Wembley Stadium

This is a big test for Joshua tonight as Povetkin brings qualities that none of his previous opponents boast.

How he deals with a constantly moving opponent will be instructive as to his future.

You know there is a big fight in the offing when Michael Buffer steps into the ring. And now the 'Voice of Boxing' conducts the crowd for a stirring rendition of 'Sweet Caroline'. Right, let's forget about the rest of the night. The show starts now.

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Fair to say Tyson Fury is not too impressed with the undercard so far. We can't tell you what he has said. But you can guess. It's not complementary.

British heavyweight Dillian Whyte said: "I think Povetkin is too short. Joshua will just keep it moving, keep the distance long and stop him inside six. Joshua will pick him off like Klitschko did."

More from Paulie Malignaggi, who said: "I think Povetkin is one of Joshua's toughest challengers. He's very stable. Even if you knock him down he's always willing to battle.

"I just don't think he has the versatility to overtake Joshua and win a heavyweight world championship. But he has the toughness to take Joshua all the way to points and if you got a sub-par Joshua it's a risk but I don't expect a sub-par Joshua."

So just how tough is Anthony Joshua's gym routine?

Watch below as three gym-goers try to match the impressive workouts of world heavyweight champion Joshua. Could you do any better?

Watch Britain's Anthony Joshua and Russia's Alexander Povetkin weigh in from yesterday. Not long now.

Luke Reddy
BBC Sport at Wembley Stadium

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I’d say there are around 65,000 in the arena just moments before the ring walks. The traditional White Stripes ‘Seven Nation Army’ hit plays and at last we get some decent noise...

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Former two-weight world champion Paulie Malignaggi is also not too impressed that Povetkin gets a shot at Joshua's gold.

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Tony Bellew says it is an "absolute disgrace" boxers convicted of doping are allowed back after serving bans - and he predicts a fighter will be "killed at the hands of a drug cheat".

It comes as Povetkin - who has had two doping convictions - fights Joshua at Wembley tonight. Joshua's WBA, WBO and IBF heavyweight titles are on the line against the mandatory challenger from Russia.

"It shouldn't be even taking place," said Bellew.

Povetkin - the 2004 Olympic super heavyweight champion - first tested positive for meldonium in May 2016, and was banned from the sport indefinitely when he failed a second drugs test the following year. At the time of his first failed test, Povetkin said he had stopped taking meldonium in 2015, before it became a banned substance.

In November 2017, the 39-year-old's ban was reduced to a year and Bellew, the former WBC cruiserweight world champion, says boxing authorities do not take doping "seriously enough".

"It is an absolute disgrace that these guys are getting to fight," the 35-year-old told BBC Radio 5 live Breakfast. Giving time served bans is not doing anything. Alexander Povetkin, let's just be straight and honest, should not be even in this fight. It shouldn't be even taking place, but it has to take place all because of governing bodies and sanctioning bodies. Mark my words, one day it's going to happen - someone is going to be killed at the hands of a drug cheat."

We will be watching Russia's Alexander Povetkin soon. But many are unhappy that he is in this fight to start with.

That's Luke Campbell winning a final eliminator for the WBC lightweight championship. So who next for Campbell? Well, in the murky world of boxing we're not totally sure.

That's because WBC champion Mikey Garcia is expected to vacate his belt to pursue a fight with IBF welterweight title-holder Errol Spence Jr.

Even as the scores are being announced Yvan Mendy is bouncing around giving the impression that he has got this.

The judges say no, no way. 119-109, 118-111, 116-112 are the margins, so 10, seven and four-round margins. Next up the main event...

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So who has won? Both men think they have got the job done. Yvan Mendy raises his arm at the end. Luke Campbell is lifted up by someone in his corner. Surely Campbell has got this. Not a classic.

We go to the judges scorecards.

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Figkig: For me its gotta be Povetkin, hate me all you want. Very experienced boxer and seems to be hitting his peak towards the end of his career, has great speed and huge knockout power. Would pick apart Wilder's wild swings and Fury not at that level yet (since comeback).